Lantern-slide projecting apparatus



May l, 1923.

R. C. SMITH LANTERN SLIDE PROJECTING APPARATUS Filed April 2O 1921 2 Sheets-Sheet 2 lwuentoz Ric/mwah# A755 v.

- attoznegd ,Patented May l, 1923.

UNITE,`

k'Bierman` CQ SMITH, or SEATTLE, 'wAsHINGToN lL A'NTnaiv-SLI,DE PnoJEoTING APPARATUS.

Appncation ined' April eo, 1921. serieu No. 462,874.'

I To all whom t may concern." Y Y Be it known that I,`R1oHA-nn C. SMITH, 'a subject of the King of England,`and`resi dent of the city of Seattle,'in the countyof King and State of Washington, havezinvented certain new andv useful Improvementsin Lantern-Slide Projecting Apparatus, of which the following is a specification.

l My invention relatesto lantern slide projecting apparatusA in which a slide ,carrying member is automatically given anintermittent movement to advance individual slides into and out ofprojecting position. My deviceis particularly intended` for use in the projection ofl advertising slides.. v

The principal object ofmy vinvention is-to simplify such devices without sacricing eficient' and positive operation thereof. x fr,"-

Another object isy to provide an intermit! j tent feed mechanism, and in `connection,

therewith a positive lock for the slide-carrying members which` wi-ll maintainthemxed in position "until they are-released to permit their advance, whereupon the locking mechanism will again function to Vsecure themvin the new position ure l, showing amodied form.

Figure 4 is a perspective view of a slideholding channel unit. i Y .The slides ll .are suitably mounted upon a slide carrying member which I have shown as the disk or wheel l; It is largely imma# terial. in what positionor in what manner the slidesare-mounted upon4 thedisk 1, but

the preferable mounting isas shownin Figi ures l and 3, wherein they project radially in theplane of the disk and are-placed edge to edge upon itsperiphery.` v-They are held n in place thereupon -by` suitable'- guides 10. These are channel shaped, and are secured to the disk, and have at their outer ends spring clips or other retaining members 12. The

channels l0 vreceive theside edges of the slides', Vand the clips l'l2 'engagetheir outerL or top edges toretain them in'positionupon the :disk 1.' Any'other suitable securing means Amay be employed for thesel slides.

Further, the slide carrying :member need not be a disk,` asfshown, but maybeany suitable member.

carried upon a suitable sprocket wheel as the slide carrying member, or 'an annular rmg, -as these andlike members are well- `known in the art.

lflrssociatedv with the slide carrying mem# ber, though preferably not integral there- It is not outside vof the scopeof my invention to provide a` chain.`

with,l are means for advancing the same intermittently. I have shown'a toothedwheel 2 `which is secured upon the same shaft .2lk

as that which carries Ythe disk Tlf. The vteeth 22 of the wheel 2 are engageableby-aspring pressed pawl 28 which is-secured upon a' re-` ciprocable bar 24. rljhe bar 24 is suitably supported in guides 25 and has secured therevto aspring 126 or equivalentmeans to return the bar to `its normalpositionyafter'it has been advanced by means to be laterrv de-r scribed. When the barv24-is advanced, this occurring at intervals,ntheengagement of the pawl 23'withvthe teeth 22 vofthe wheel i 2advances the wheel and consequentlythe slidecarrying diskl.- The .advance of the bar 24 is regulated to be sufficient to advance the disk l by theqspacing between the individual slides' 1l.

1` The bar y24.ha`s securedT thereto aprojec-l tion or pin' 27, and'this pin 27 is engaged during a part of the rotation 'ofa tripl arm ,3, which rotates regularly and which'` is se-l curedupon a sha-ft 30.4 The arm 3 is pref# erablyprovided at its outery end with an olsetportionl Vwhich-'is curved to corre'- spond'with the arc described'by the' outer endA off-the arm 3 for a purpose to fbefde scribed later. 'Either the pin27A or the arm 3, or both, may be' made adjustable vinl length, if desired.

Y Securedupon the shaft' 30 are a pair of cams 4 axially spaced upon the shaft. One of these lclams has a1lugf4l upraised'from its4 peripheral. camsurface,l andthe other cam hasy a; corresponding depression y42y placedsubstantiallyjopposite the llug 4l, and

offsubstantially equal angular extentl? @A` lever 5, which'is fixedly pvotedvrat `50k beg Ween its ends, terminates aty en@ end n a yoke, the arms-,51 of which eXtend'on op-` L'Jl the teeth 22.

posite sides of the cams 4. Followers, consisting of the rollers mounted in the arms 5l, engage the cam surfaces. The engagement of the lug 4l with one of the rollers 52 and the simultaneous engagement of the opposite roller 52 with the depression 42 oscillates the lever 5 upon its pivot. ,Its other end is provided With teeth 53 which are engageable with the teeth 22 of the Wheel 2, to lock the Wheel, and consequently the slide carrier l, in fixed position .during most of the iotation of the cams 4.

',Ihe trip arm 3 is so positioned upon the shaft that, upon oscillation of the lever 5, as described, the Wheel 2 and the slide carrier l are unlocked, and the bar 24 is advanced by engagement of the trip arm with the pin 27 to advance the slide carrier. The curved projection 3l of the trip arm retains the pin 27 at vanced until the followers 52 have passed beyond the lug 4l and depression 42, whereby the slide carrier is retained in advanced position until the locking teeth are again engaged with This obviates the possibility of a return movement of the slide carrier due to a prematurereturn of the bar 24. The grooves between the teeth 53 which receive the teeth 22, are inclined in both directions; therefore, if the slide is a little to either side of the proper projecting position, the tendency of the engagement of the teeth 22 With these grooves between the teeth 53 is to exactly and properly position the slide. A motor 6 is provided for driving the shaft 30 through a suitable belt 61.

rIhe reciprocable bar 24 need not necessarily engage directly the ydisk 2 of the slide carrier l. For the purpose of the claims, in referring to the slide-carrying member as engaged by an intermittently-operable device, I desire the term slide-carrying member to include any gear, slide, or other member in a train supporting or advancing the slides, or it may mean a chain, if this is employed. The intermittent feed meclianism described also may be replaced by any equivalent construction as, for instance, a Geneva movement. The cams 4 may be single as Well as plural. If properly timed in their rotation relative to the trip arm 3, several pairs of lugs 4l and depressions 42 may be formed upon a single set of cams. The feed teeth 22 may be of any shape found desirable, although that form shown in Figure l is my preferred form. The locking member, that is the teeth 5,3, may be engageable with the slide carrying member, as defined above, by reciprocable, oscillatory, or even rotary motion, as in a Geneva movement. as I consider these the equivalent of the form described. The bar 24 may be positively advanced and re tracted, as by a cam, if desired.

,In Figure 3 I have shown an alternative construction. In this form the teeth 22 are only employed for engagement by the paivl 23 to advance the slide carrying disk l. A second disk 2O is employed. havingA large teeth 29 thereon, spaced angularly by the spacing between the individual slides. The lever 5 is replaced by a reciprocable member 55 having a single point 56 upon its end which is reciprocable into and out of engagement with the teeth 29. A single cam having a continuous groove 46, eX- tending the greater part of the distance about the disk, has a depressed portion 47. A follower` 57 upon the end.of the locking member is engaged in the groove 46, 47. The disk 45 carrying the cam groove rotates with the trip arm 3 and gives to the locking member 55 the proper motion to release it from engagement With the teeth 29 only when the bar 24 is being advanced.

yIVhat I claim as my invention is:

1. In a lantern slide projecting apparatus, in combination With a slide-carrying member, intermittent feed mechanism therefor, operable to advance the slide-carrying mem ber and to ymaintain it advanced momentarily after an advance, cams movable in conjunction with said feed mechanism, and a locking member engageable With said slidecarrying member While it is held in advanced position and controlled by said cams to secure the slide-carrying member in fined position during the inaction of the feed mechanism and to release it to permit its advance. 2. In a lantern slide projecting apparatus, in combination with a slide-carrying inember, intermittent feed mechanism therefor, cams movable in conjunction with said feed mechanisir. means for maintaining the slidecarrying member in advanced position momentarily after an advance, and a locking member engageable with said slide-carrying member prior to its release from said latter mea-ns and 'controlled by said cams tolsecure the slide-carrying member in fixed position during the inaction of the feed mechanism and to release it to permit its .advance, said locking member being operable to exactly position lsaid slide-carrying member.

3. In a lantern slide projecting apparatus, in combinationivith a slide-carrying'member, intermittent feed mechanism vtherefor includinga rotary trip arm and operable to intermittently advance the slide-carrying member, said trip arm having a peripheral extension at its outer end to maintain the slide-carrying memberV momentarily advanced following an advance thereof, cams movable in conjunctionivith said trip and a lockingv'lever engageable with said slide-carrying member'vhile it is held in advanced position and controlled by said cams to secure the slidfe-carryingmember in fixed position during the inaction of the feed mechanism and to release it to permit its advance.

4. In a lantern slide projecting apparatus, in combination with a slide-carrying member, intermittent feed mechanism therefor, a pair of rotary cams movable in conjunction with said feed mechanism, one of said cams having a lug upraised therefrom, and the other cam having an opposite depression of substantially equal angular extent, a locking lever pivoted between its ends, one

end being engageable With said slide-carry-l ing member to lock it in fixed position during the inaction of the feed mechanism, and to release it during its advance, and the other end of the locking lever terminating in a yoke each arm of which extends adjacent one of the cams, and a follower secured in each armof the engageable each or depression.

5. In a lantern slide projecting apparatus, in combination with a slide-carrying member, intermittent feed mechanism for advancing said slide-carrying member, positive locking means for said slide-carrying member, means for releasing said locking means to permit advance of the slide-carrying member7 a rotary trip arm in conjunction With the releasing'and locking means for retaining said slide-carrying member in With'its respective cam lug yoke, and simultaneously advanced position until the loc-king means is in operative position.

6. In a lante-rn slide projecting apparatus, in-combination With a eslide-carrying member, intermittent feed mechanism therefor including a reciprocable bar, positive locking means for said slide-carrying member, means for releasing saidy locking means to permit advance of the slide-carrying member, bar to advance it While the lock is released, and al circular arc extension on said trip arm operable to maintain said bar advanced until the lockingtmeans is again in opera? tive position. 7, An intermlttent mechanical movement including, in combination With a member to' be advanced, intermittent feed mechanism therefor, including means for maintaining it in advanced position momentarily following an advance, a locking member engageable with said first member prior" to release thereof by the momentary holding means, and cams Withsaid feed mechanism to secure said lirst member in fixed position during the inaction of the feed mechanism, and to release it to permit its advance.

Signed at Seattle, King county, Washington, this 12th day of April, 1921.

RICHARD o. SMITH.

movable in conjunction a rotary trip karm engageable with said I 

